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resource of the ",(0,o.jsx)(s.code,{children:"System"})," for which we register a hook."]}),(0,o.jsx)(s.pre,{"data-language":"solidity","data-theme":"default",children:(0,o.jsx)(s.code,{"data-language":"solidity","data-theme":"default",children:(0,o.jsxs)(s.span,{className:"line",children:[(0,o.jsx)(s.span,{style:{color:"var(--shiki-token-keyword)"},children:"import"}),(0,o.jsx)(s.span,{style:{color:"var(--shiki-color-text)"},children:" { "}),(0,o.jsx)(s.span,{style:{color:"var(--shiki-token-function)"},children:"BEFORE_CALL_SYSTEM"}),(0,o.jsx)(s.span,{style:{color:"var(--shiki-color-text)"},children:", "}),(0,o.jsx)(s.span,{style:{color:"var(--shiki-token-function)"},children:"AFTER_CALL_SYSTEM"}),(0,o.jsx)(s.span,{style:{color:"var(--shiki-color-text)"},children:" } "}),(0,o.jsx)(s.span,{style:{color:"var(--shiki-token-keyword)"},children:"from"}),(0,o.jsx)(s.span,{style:{color:"var(--shiki-color-text)"},children:" 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the system hook contract.\nIt has two functions:"}),(0,o.jsxs)(s.ul,{children:["\n",(0,o.jsxs)(s.li,{children:[(0,o.jsx)(s.code,{children:"onBeforeCallSystem"}),", which is executed before the call"]}),"\n",(0,o.jsxs)(s.li,{children:[(0,o.jsx)(s.code,{children:"onAfterCallSystem"}),", which is executed after the call"]}),"\n"]}),(0,o.jsx)(s.p,{children:"Both functions get the sender, the system being called, and the call data it receives."}),(0,o.jsx)(s.pre,{"data-language":"solidity","data-theme":"default",children:(0,o.jsxs)(s.code,{"data-language":"solidity","data-theme":"default",children:[(0,o.jsxs)(s.span,{className:"line",children:[(0,o.jsx)(s.span,{style:{color:"var(--shiki-color-text)"},children:"    "}),(0,o.jsx)(s.span,{style:{color:"var(--shiki-token-keyword)"},children:"revert"}),(0,o.jsx)(s.span,{style:{color:"var(--shiki-color-text)"},children:"("}),(0,o.jsx)(s.span,{style:{color:"var(--shiki-token-string-expression)"},children:'"Just say 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